display goal miss texture in a football game.

following is the code to display goal and miss goal texture. this code works fine but having problem to display "miss Goal" texture.

  function OnTriggerEnter(hit : Collider){
         if(hit.gameObject.tag == "Ball")
         {
                 //goalDone = true;
                 //Goal.enabled = true; //make sure you set this to false in the inspector as I said before else it will do nothing
                 
                 if(countBalls.ballcount==1){
                  greenPos1.enabled = true;
                  greyPos1.enabled = false;
                  //CancelInvoke("DisplayNoGoal");
                 was_cancelled = true;
                 }
             
             if(countBalls.ballcount==2){
                 greenPos2.enabled = true;
                 greyPos2.enabled = false;
                 was_cancelled2 = true;
                 
                 
             }
     play_movie.goal=true;
                    audio.clip = Goalsound;
                 audio.Play();
                 GameObject.Find ("Goal in").GetComponent(BoxCollider).enabled = false;
                    yield WaitForSeconds(3);
                 Goal.enabled = false;
                    play_movie.goal=false;
                    
              
                  goalCount++;
                  finalScore++;
     }
     }
   
  function OnGUI(){
                   
                 Debug.Log("Gui texture");
                 //print("goalCount:"+goalCount);
                 GUI.Label(new Rect(145,592,200,50),finalScore+"/6",goalStyle);
                 
                 
                 if(countBalls.ballcount == 1 && !was_cancelled){
                     //greyPos1.enabled = true;
                     Invoke("DisplayNoGoal",5.0);
                 }
             
                 if(countBalls.ballcount == 2 && !was_cancelled2){
                     //greyPos2.enabled = true;
                     Invoke("DisplayNoGoal2",5.0);
                     
                 }
     }

 function DisplayNoGoal()
 {    
     if(countBalls.ballcount == 1 && !was_cancelled){
             
         redPos1.enabled = true;
         playmiss();
         
         
     }
 }
 
 function DisplayNoGoal2()
 {    
     if(countBalls.ballcount == 2 && !was_cancelled2){
         
         redPos2.enabled = true;
         playmiss();
     }
 }

  function playmiss(){
 
              Play_movie2.miss=true;
              //audio.clip = missedsound2;
             audio.PlayOneShot(missedsound2);
             //audio.Play();
              yield WaitForSeconds(3);
             //Play_movie2.miss=false;
             print(cnt++);
             test1 =false;
             
  }

the problem i m facing here is that when once the playmiss() is called then it keeps executing repeativly and it keeps playing the audio in playmiss()...so please let me know where i m making mistake??